6-35
Change Connection
During multidrop applications, the Mass ProPlate EA is connected
to one device at a time. Use the following procedure to change this
connection pointer.
1. Select T
ransmitter, HART Output, Connect to display the Connect
screen
2. Select Transmitters O
nline.
3. Select P
oll.
The EA searches for all connected Mass ProPlate transmitters,
then displays found transmitters in the “Devices Online” box.
Devices are identified by address and software tag.
4. Select the desired device from the Mass ProPlates identified in the
“Transmitters Online” window and select OK.
The Mass ProPlate EA is now connected to the device selected in
Step 4. If security is enabled, the EA displays the Privileges screen.
5. Enter a password for the new device, then select OK.
Transmitter HART Output Burst Mode
When the Mass ProPlate is configured for burst mode, it provides faster
digital communications from the transmitter to the control system by
eliminating the time required for the control system to request
information from the transmitter.
Burst mode is compatible with use of the analog signal. Because HART
protocol features simultaneous digital and analog data transmission,
the analog value can drive other equipment in the loop while the
control system is receiving the digital information. Burst mode applies
only to the transmission of burst data (see Figure 6-25 on page 6-30),
and does not affect the way other transmitter data is accessed.
Access to information other than burst data is obtained through the
normal poll/response method of HART communication. The EA or the
control system may request any of the information that is normally
available while the transmitter is in burst mode. Between each burst
message sent by the transmitter, a short pause allows the EA or control
system to initiate a request. The transmitter will receive the request,
process the response message, and then continue “bursting” the data
approximately three times per second.
Burst mode is not compatible with multidropping more than one
transmitter because there is no method to discriminate the data
communications from multiple field devices.
To Next Page
Loading...
